Cancel a task
    A task can be canceled at runtime. You cannot run  a canceled task.
Making a task cancelable
      You can cancel a task if the value returned from reading its 
IsCancellationRequested
 property is appropriately managed in the method that executes, usually using conditional instructions.The 
IsCancellationRequested
 property can have the following values:
        - false
- Cancellation not requested.
- true
- Cancellation requested.
To use the property within the method,  indicate the task as the argument of the same method, specifying its type.
In the following example, 
myTask
 is a task and ProcessCsvFile()
 is the method that executes:
        private void ProcessCsvFile(LongRunningTask myTask) { // Code to execute }
For a complete example, see Constructor: LongRunningTask(action, executingNode).
Cancel a task
      You cancel a task by invoking the 
Cancel()
 method on the task. See the following example.
        myTask.Cancel();
The method sets the value of the task 
IsCancellationRequested
 property to True
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